The papers include miscellaneous letters, letterbooks, books, certificates, and diplomas of various members of the Muhlenberg family. Among them are photostats of letters and papers of General John Peter Gabriel Muhlenberg and officers of the Continental Army on military affairs in the Southern Department during the American Revolution (1772-1804); photostats of letters to Albert Gallatin, Nathanael Greene, Edward Hand, Winthrop Sargent, Baron von Steuben, William Alexander, and George Washington; photostat of General Muhlenberg's journal of trips to the Ohio (1784, 1797); photostats of letters and notes of Gotthilf H. E. Muhlenberg, including a diary kept at Halle (1771) and extracts of thirty letters to Stephen Elliott of Beaufort and Charleston, South Carolina (1808-1815); photostats of letters of Henry A. Muhlenberg about his biography of General Muhlenberg (1848-1849); and photostats of letters of Henry Melchior Muhlenberg (1711-1787). Also included is an original letterbook of Peter Muhlenberg, paymaster of the United States Army, kept at Augusta and Savannah, Georgia (1836-1842). Henry Muhlenberg's notebooks (1784-1813), written in Latin or German script, in a small hand, includes a wealth of botanical observations, with a focus on Lancaster, Pennsylvania. The Henry Muhlenberg journals are a record of daily occurrences, with many features of a commonplace book, containing prescriptions, notes of questions asked candidates for the Lutheran ministry, and the plan of a barn. There is also a biographical account of Rev. Henry Melchior Muhlenberg (1711-1787).

A collection of letters, legal papers and financial records of three generations of the prominent Philadelphia family. Spanning 1745-1955, detailed are the legal cases and political advocacy work of John Kintzing Kane (1795-1858), Robert Patterson Kane (1827-1906), and Francis Fisher Kane (1866-1955). Also includes correspondence, architectural drawings, and photograph albums of the Cope family. Robert Patterson Kane's daughter Eliza Middleton Kane (1863-1952) married the Philadelphia architect Walter Cope (1860-1902) in 1893. The APS papers of Elisha Kent Kane are in call no. B K132.

A collection of business and personal papers of three generations of the prominent Philadelphia Jewish family from 1750-1974. Business records include trade and land transactions (some in Yiddish) of the Gratz brothers, Barnard and Michael (1750-1804) with the business continued by Michael's sons: Simon, Hyman, Joseph, Jacob, and Benjamin (1791-1861). Personal correspondence are primarily letters to Rebecca Gratz from her sisters Rachel and Sarah (1795-1867) with later correspondence to Rachel's children: Horace and Sara Moses (1832-1879). Contains a small group of French letters related to Napoleon III, collected by family member Miriam Fox, and some heirloom artifacts.